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Staphylea trifolia, a shrub native to the eastern United States and Canada, is one of only two species within the Staphyleaceae native to North America north of Mexico. The other is S. bolanderi, a California endemic. While the Staphyleaceae is relatively widespread, other families within theCrossosomatales are restricted in distribution. The closest North American relatives to the Staphyleaceae belong to the Crossosomataceae, and are distributed in the southwestern United States and Mexico. Read more »